09.8_New_Madrid_Seismic_Zone_activity_1974-2011.png

Map showing concentration of earthquakes near the border of Missouri, Kentucky, Tennessee, and Illinois

High density of earthquakes in the New Madrid seismic zone.

By Kbh3rd (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons

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